Documentation:

• Google Doc
• MDN Doc (Mozilla Developer Network)
• Web.dev PWA by members of the Chrome team, and external experts.
• W3C Manifest App

Articles:

• Learn Progressive Web Apps with 30DaysOfPWA Series' Articles by Nitya Narasimhan, 2022
  • #27 - Best Practices for PWA: Authentication with federated, webauthn
• https://14islands.com/blog/2017/01/19/progressive-web-app-from-scratch/ 2017
• https://14islands.com/blog/2016/12/15/vecka-progressive-web-app/ 2016

Tools:

• PWA Builder
  • https://github.com/pwa-builder/
• https://progressier.com/
• Take a screenshot website online
  • https://pikwy.com/